//----------------------------------------------------------------------------
//  XC program; finite element analysis code
//  for structural analysis and design.
//
//  Copyright (C)  Luis Claudio Pérez Tato
//
//  This program derives from OpenSees <http://opensees.berkeley.edu>
//  developed by the  «Pacific earthquake engineering research center».
//
//  Except for the restrictions that may arise from the copyright
//  of the original program (see copyright_opensees.txt)
//  XC is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or 
//  (at your option) any later version.
//
//  This software is distributed in the hope that it will be useful, but 
//  WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details. 
//
//
// You should have received a copy of the GNU General Public License 
// along with this program.
// If not, see <http://www.gnu.org/licenses/>.
//----------------------------------------------------------------------------
//FVector.h

#ifndef FVector_h
#define FVector_h

#include <iostream>
#include <cstddef>

namespace XC {
class Vector;

//! @ingroup FEMisc
//!
//! @defgroup ElemFV Element internal forces.
//
//! @ingroup ElemFV
//! @brief Element internal forces.
class FVector
  {
  public:
    virtual const double &operator[](size_t i) const= 0;
    virtual double &operator[](size_t i)= 0;
    virtual void zero(void)= 0;
    virtual size_t size(void) const
      { return 0; }
    virtual double *getPtr(void)
      { return nullptr; }
    virtual void Print(std::ostream &os) const= 0;
    virtual ~FVector(void)
      {}

    virtual void addForce(const size_t &inod,const double &,const double &,const double &);
    virtual void addMoment(const size_t &inod,const double &,const double &,const double &);
  };

std::ostream &operator<<(std::ostream &,const FVector &);

} // end of XC namespace

#endif


